Assignment 6

gistfile1.cpp

#ifndef MAC //if not MAC
#include <GL\glut.h>
#else // MAC includes below
#include <GLUT/glut.h>
#endif

/**********************
::: UTILITY CLASSES ::: 
***********************/

struct Planet { // Our cute little planet class
  GLfloat size, speed, angle, distance, color[3];
  Planet() {}
};

// Our Menu Options
enum MENU_TYPE { ABOVE, BELOW, SIDE, SUN, DEFAULT };


/*************************
::: GLOBAL VARIABLES ::: *
*************************/

Planet planets[10];     // An array for all the planets to loop through
GLfloat width = 1290.0; // Initial screen width
GLfloat height = 800.0; // Initial screen height


/*************************
::: CALLBACK FUNCTIONS :::
*************************/

void display() {
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  
  for (int i = 0; i < 10; ++i) {
    glPushMatrix();
      glRotatef(planets[i].angle, 0, 1, 0);
      glTranslatef(planets[i].distance, 0, 0);
      glColor3fv(planets[i].color);
      glutSolidSphere(planets[i].size, 50, 50);
    glPopMatrix();
  }

  glutSwapBuffers();
}

void idle() {
  for (int i = 0; i < 10; ++i) {
    planets[i].angle = planets[i].angle + planets[i].speed;
  }
  glutPostRedisplay();
}

void reshape (int w, int h) {
  glViewport(0, 0, (GLsizei) w, (GLsizei) h); 
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  gluPerspective(45, width / height, 1, 5000);
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
  gluLookAt(100.0, 200.0, 800.0,      0.0, 0.0, 0.0,     0.0, 1.0, 0.0);
}

void menu(int item) {
  glLoadIdentity();

  switch (item) {
    case ABOVE:
    gluLookAt(0.1, 2000.0, 0.0,       0.0, 0.0, 0.0,     0.0, 1.0, 0.0);
    break;
    case BELOW:
    gluLookAt(0.1, -2000.0, 0.0,      0.0, 0.0, 0.0,     0.0, 1.0, 0.0);
    break;
    case SIDE:
    gluLookAt(0.0, 0.0, 800.0,        0.0, 0.0, 0.0,     0.0, 1.0, 0.0);
    break;
    case SUN:
      gluLookAt(40.0, 0.0, 0.0,       41.0, 0.0, 0.0,     0.0,1.0, 0.0);
    break;
    case DEFAULT:
      gluLookAt(100.0, 200.0, 800.0,  0.0, 0.0, 0.0,     0.0, 1.0, 0.0);
    break;
  }

  glutPostRedisplay();
}


/*******************************
::: INITIALIZATION FUNCTIONS :::
*******************************/

void init() {
  GLfloat ambient_light[]    = { 1.0, 1.0, 1.0, 1.0 };
  GLfloat diffuse_light[]    = { 1.0, 1.0, 1.0, 1.0 };
  GLfloat specular_light[]   = { 1.0, 1.0, 1.0, 1.0 };
  GLfloat light_position_0[] = { 0.0, 0.0, -725.0, 1.0  };
  glShadeModel (GL_SMOOTH);
 glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse_light);
  glLightfv(GL_LIGHT0, GL_SPECULAR, specular_light);
  glLightfv(GL_LIGHT0, GL_POSITION, light_position_0);

  glEnable(GL_LIGHTING);
  glEnable(GL_LIGHT0);
  glEnable(GL_DEPTH_TEST);

  glEnable(GL_COLOR_MATERIAL);
}

void initMenu() {
  glutCreateMenu(menu);
  glutAttachMenu(GLUT_RIGHT_BUTTON);
  glutAddMenuEntry("Above",   ABOVE);
  glutAddMenuEntry("Below",   BELOW);
  glutAddMenuEntry("Side",    SIDE);
  glutAddMenuEntry("Sun",     SUN);
  glutAddMenuEntry("Default", DEFAULT);
}

void initPlanets() {
  // THE SUN
  Planet sun = Planet();
  sun.size = 40;
  sun.speed = 0;
  sun.angle = 0;
  sun.distance = 0;
  sun.color[0] = 255 / 255.0;
  sun.color[1] = 100 / 255.0;
  sun.color[2] = 30 / 255.0;
  planets[0] = sun;
  
   // Earth
  Planet earth = Planet();
  earth.size  = 2.5;
  earth.speed = 1;
  earth.angle = 0;
  earth.distance = 100;
  earth.color[0] = 63  / 255.0;
  earth.color[1] = 95  / 255.0;
  earth.color[2] = 111 / 255.0;
  planets[3] = earth;


  // MERCURY
  Planet mercury = Planet();
  mercury.size    = earth.size * 0.38;
  mercury.speed   = earth.speed * 1.607;
  mercury.angle   = 0;
  mercury.distance = earth.distance * (0.387 + 0.15);
  mercury.color[0] = 1 / 255.0;
  mercury.color[1] = 1 / 255.0;
  mercury.color[2] = 1 / 255.0;
  planets[1] = mercury;

  // VENUS
  Planet venus = Planet();
  venus.size  = earth.size * 0.95;
  venus.speed = earth.speed * 1.174;
  venus.angle = 0;
  venus.distance = earth.distance * (0.723 - 0);
  venus.color[0] = 148 / 255.0;
  venus.color[1] = 85  / 255.0;
  venus.color[2] = 22  / 255.0;
  planets[2] = venus;


  // Mars
  Planet mars = Planet();
  mars.size  = earth.size * 0.53;
  mars.speed = earth.speed * 0.802;
  mars.angle = 0;
  mars.distance = earth.distance * (1.524 - 0);
  mars.color[0] = 200 / 255.0;
  mars.color[1] = 40 / 255.0;
  mars.color[2] = 40  / 255.0;
  planets[4] = mars;

  // Jupiter
  Planet jupiter = Planet();
  jupiter.size  = earth.size * 11.19;
  jupiter.speed = earth.speed * 0.434;
  jupiter.angle = 0;
  jupiter.distance = earth.distance * (5.203 - 3);
  jupiter.color[0] = 250 / 255.0;
  jupiter.color[1] = 50 / 255.0;
  jupiter.color[2] = 50 / 255.0;
  planets[5] = jupiter;

  // Saturn
  Planet saturn = Planet();
  saturn.size  = earth.size * 9.4;
  saturn.speed = earth.speed * 0.323;
  saturn.angle = 0;
  saturn.distance = earth.distance * (9.539 - 5);
  saturn.color[0] = 200 / 255.0;
  saturn.color[1] = 100 / 255.0;
  saturn.color[2] = 40 / 255.0;
  planets[6] = saturn;

  // Uranus
  Planet uranus = Planet();
  uranus.size  = earth.size * 4.04;
  uranus.speed = earth.speed * 0.228;
  uranus.angle = 0;
  uranus.distance = earth.distance * (19.18 - 12);
  uranus.color[0] = 20 / 255.0;
  uranus.color[1] = 20 / 255.0;
  uranus.color[2] = 130 / 255.0;
  planets[7] = uranus;

  // Neptune
  Planet neptune = Planet();
  neptune.size  = earth.size * 3.88;
  neptune.speed = earth.speed * 0.182;
  neptune.angle = 0;
  neptune.distance = earth.distance * (30.06 - 21);
  neptune.color[0] = 90  / 255.0;
  neptune.color[1] = 70  / 255.0;
  neptune.color[2] = 120 / 255.0;
  planets[8] = neptune;

  // Pluto
  Planet pluto = Planet();
  pluto.size  = earth.size * 0.48;
  pluto.speed = earth.speed * 0.159;
  pluto.angle = 0;
  pluto.distance = earth.distance * (39.52 - 29);
  pluto.color[0] = 0 / 255.0;
  pluto.color[1] = 0 / 255.0;
  pluto.color[2] = 200 / 255.0;
  planets[9] = pluto;
}


/********************
::: MAIN FUNCTION :::
********************/

int main(int argc, char **argv) {
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);
  glutInitWindowSize(width, height);
  glutInitWindowPosition(0,0);
  glutCreateWindow("The Galaxy");
  
  initMenu();
  initPlanets();
  init();
  
  glutReshapeFunc(reshape);
  glutDisplayFunc(display);
  glutIdleFunc(idle);
  glutMainLoop();
  return 0;
}